WO2006064723A1 - Appareil et procede de production d’ebauche - Google Patents

Appareil et procede de production d’ebauche Download PDF

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Publication number
WO2006064723A1
WO2006064723A1 PCT/JP2005/022633 JP2005022633W WO2006064723A1 WO 2006064723 A1 WO2006064723 A1 WO 2006064723A1 JP 2005022633 W JP2005022633 W JP 2005022633W WO 2006064723 A1 WO2006064723 A1 WO 2006064723A1
Authority
WO
WIPO (PCT)
Prior art keywords
mold
preform
receiving surface
preform manufacturing
molten glass
Prior art date
Application number
PCT/JP2005/022633
Other languages
English (en)
Japanese (ja)
Inventor
Shigeki Fukuda
Makoto Kidachi
Ryosuke Sakai
Futoshi Ishizaki
Original Assignee
Ohara Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ohara Inc. filed Critical Ohara Inc.
Priority to CN200580042864.9A priority Critical patent/CN101080366B/zh
Priority to DE112005003071T priority patent/DE112005003071T5/de
Priority to US11/793,034 priority patent/US20080110207A1/en
Publication of WO2006064723A1 publication Critical patent/WO2006064723A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B19/00—Other methods of shaping glass
    • C03B19/02—Other methods of shaping glass by casting molten glass, e.g. injection moulding
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C03B11/06—Construction of plunger or mould
    • C03B11/08—Construction of plunger or mould for making solid articles, e.g. lenses
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B40/00—Preventing adhesion between glass and glass or between glass and the means used to shape it, hold it or support it
    • C03B40/04—Preventing adhesion between glass and glass or between glass and the means used to shape it, hold it or support it using gas
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B7/00—Distributors for the molten glass; Means for taking-off charges of molten glass; Producing the gob, e.g. controlling the gob shape, weight or delivery tact
    • C03B7/10—Cutting-off or severing the glass flow with the aid of knives or scissors or non-contacting cutting means, e.g. a gas jet; Construction of the blades used
    • C03B7/12—Cutting-off or severing a free-hanging glass stream, e.g. by the combination of gravity and surface tension forces
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B7/00—Distributors for the molten glass; Means for taking-off charges of molten glass; Producing the gob, e.g. controlling the gob shape, weight or delivery tact
    • C03B7/14—Transferring molten glass or gobs to glass blowing or pressing machines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates

Definitions

  • the present invention relates to a preform manufacturing apparatus and a preform manufacturing method for manufacturing a preform with a molten glass force, for example, in an optical element manufacturing process.
  • optical lenses molded into a predetermined shape are used for lenses of optical elements such as digital cameras.
  • this optical lens In order to manufacture this optical lens with high accuracy and in large quantities, for example, the following methods are known. That is, first, a molten glass is used to form a glass lump (hereinafter referred to as a preform) that approximates the shape of the optical lens, and then this preform is hot processed with a mold.
  • a preform glass lump
  • an optical lens is formed through a molten glass force preform, so that light is passed through a multi-step process such as plate-like glass force cutting, processing, pressing, polishing I ", and polishing.
  • a multi-step process such as plate-like glass force cutting, processing, pressing, polishing I ", and polishing.
  • a preform manufacturing apparatus for manufacturing the above-described preform, for example, a flow-down device that flows down molten glass from the tip of a nozzle, and a lower mold that is provided below the flow-down device and receives the molten glass that has flowed down
  • a preform manufacturing apparatus including: an upper mold that fits into the lower mold (see Patent Document 1).
  • this preform manufacturing apparatus first, the molten glass is allowed to flow from the flow-down device to the lower mold. Then, the molten glass that has flowed down is received by the lower mold and melted. It becomes a molten glass lump. Thereafter, the upper mold is fitted to the lower mold to form a molten glass lump, and a preform is manufactured.
  • Patent Document 1 JP-A-7-165431
  • an object of the present invention is to provide a preform manufacturing apparatus and a preform manufacturing method capable of manufacturing a preform at a low cost.
  • a preform manufacturing apparatus of the present invention is a preform manufacturing apparatus including a first mold that receives molten glass and a second mold that receives the molten glass lump moved by the first mold force.
  • the first mold has a receiving surface for receiving the molten glass, and the receiving surface can be divided into two or more split molds.
  • the molten glass flows down with the first mold closed. Then, the molten glass that has flowed down is received by the first mold and becomes a molten glass lump. Thereafter, the molten glass lump is moved from the first mold cover, and this molten glass lump is received by the second mold. Thereafter, a molten glass lump is formed with this second mold to produce a preform. Therefore, after the hot molten glass is received by the first mold and the temperature of the molten glass lump is lowered, the molten glass lump can be moved to the second mold and molded. Since the surface of a certain second mold can be suppressed from being oxidized, a preform that does not require the early replacement of the second mold can be manufactured at a low cost.
  • a flow down device for flowing down the molten glass, and a moving device for moving the molten glass block from the first mold to the second mold, the first mold is the flow down Under the device It is preferable that the second mold is provided below the first mold.
  • the moving device opens and closes the first mold. According to this invention, since the moving device is configured to open and close the first mold, the glass block received by the first mold can be easily moved to the second mold.
  • the moving device opens the first mold by rotating the split mold by force downward.
  • the split mold of the moving device is configured to rotate downward, the split mold can be reliably opened and closed with a simple structure.
  • the receiving surface has a shape in which a downward force is also expanded upward.
  • the receiving surface is substantially horizontal, when the first mold is opened with the molten glass block accommodated in the first mold, the molten glass block is caught by the split mold, and the surface of the molten glass block is displayed. In some cases, a horizontal force was applied to the surface, making it difficult to accurately drop the molten glass block into the second mold.
  • the receiving surface has a shape that is expanded from the bottom to the top, it is possible to prevent a force from acting on the surface of the molten glass lump in the horizontal direction, and the molten glass lump. Can be accurately dropped by the second mold below.
  • the receiving surface is preferably conical.
  • the receiving surface is preferably conical, and the apex angle of the cone is preferably 30 degrees or more. In the present invention, the receiving surface is preferably conical, and the apex angle of the cone is preferably 150 degrees or less. The apex angle of the cone is preferably 60 ° or more and 150 ° or less, more preferably 80 ° or more and 130 ° or less, and further preferably 90 ° or more and 120 ° or less.
  • a plurality of cavity surfaces are formed in the first mold, and that the receiving surface also selects an intermediate force of the plurality of cavity surfaces.
  • the receiving surface is configured to select intermediate forces of the plurality of cavity surfaces by changing the posture of the first mold.
  • the receiving surface can be selected from among a plurality of cavity surfaces simply by changing the posture of the first mold. Therefore, the frequency of use of each cavity surface can be reduced, and the first mold can be reduced.
  • the long term Can be used.
  • the opening width of the first mold is preferably 1.2 times or more of a desired preform diameter. It is more preferable that the opening width of the first mold is 1.2 times or more of the desired preform diameter. 1. 3 times or more is more preferable. 1. 4 times or more is more preferable.
  • one or both of the first die and the second die is a receiving surface force metal or a gold alloy.
  • the receiving surface of the first mold is made of gold or a gold alloy, the wettability between the receiving surface of the first mold and the molten glass lump is deteriorated, and it becomes difficult to fuse with the first mold. Therefore, it is possible to prevent seizure and scratches caused by fusion between the first mold and the molten glass lump.
  • the receiving surface of the second mold can be made of gold or a gold alloy.
  • the flow down device flows down a molten glass having a log 7? (7? Is a viscosity, a unit is Poise) of 7.65 or less.
  • the second mold has a second receiving surface for receiving the molten glass lump, and the second receiving surface has a shape expanded from below to above.
  • a structure having an outlet from which gas is ejected can be provided below the second receiving surface.
  • the second receiving surface is preferably conical.
  • the preform production apparatus of the present invention can produce spherical preforms or coarse balls for polishing balls.
  • a spherical preform can be produced while rotating the molten glass lump moved by the first mold force by the gas jetted downward from the second receiving surface.
  • the molten glass lump can be formed in a state of being in intermittent contact with the second receiving surface. Therefore, during preform molding, the molten glass lump can be molded in a substantially floating state within the second receiving surface, so that a spherical preform that can be easily rotated by the gas from the jet nozzle is manufactured. Can do.
  • the molten glass can be cut from the flow-down device and moved to the second receiving surface in a state of a molten glass lump. Therefore, it is possible to prevent striae due to the entanglement of the yarn that does not start forming the preform on the second receiving surface while the yarn is pulled from the flow-down device. Also, once the molten glass is received by the first mold, Since it moves to 2 type
  • the first receiving surface can prevent the gas that is also ejected downward from the second receiving surface, the temperature of the nozzle due to the influence of the gas ejected from below the second receiving surface is reduced. Variation and reduction can be prevented, and the molten glass can flow down at a stable temperature.
  • the produced spherical preform can be used as a preform for producing an optical element by precision press molding, a rough sphere for abrasive balls, or an intermediate for producing a preform for precision press molding.
  • the coarse ball for a polishing ball can be used as a preform for producing an optical element after polishing.
  • Spherical preforms are not intended to be perfectly spherical in appearance, such as polyhedrons that are close to elliptical spheres, or elliptical spheres that have a plurality of planes in which some of their faces are recessed. It may be.
  • the preform manufacturing method (claims 18 to 29) of the present invention is a development of the preform manufacturing apparatus (claims 1 to 16) described above as a preform manufacturing method. . According to this preform manufacturing method, the same effects as those described in the preform manufacturing apparatus described above can be obtained.
  • the preform manufacturing apparatus and preform manufacturing method of the present invention the following effects can be obtained.
  • the high temperature molten glass is received by the first mold, and after the temperature of the molten glass lump has dropped, the molten glass lump is moved to the second mold to be molded. Therefore, it is possible to manufacture a preform at a low cost without having to replace the second mold at an early stage.
  • FIG. 1 is a schematic cross-sectional view of a molten glass agglomeration apparatus constituting a preform manufacturing apparatus according to an embodiment of the present invention.
  • FIG. 2 is an enlarged cross-sectional view showing a state where the first mold according to the embodiment is opened.
  • FIG. 3 is a schematic cross-sectional view of the press molding apparatus according to the embodiment.
  • FIG. 4 is a schematic cross-sectional view showing a state in which a molten glass flow has flowed down from the flow down device according to the embodiment to the first mold.
  • FIG. 5 is a schematic sectional view showing a state where the first mold according to the embodiment is opened.
  • FIG. 6 is a schematic sectional view showing a state where the second mold according to the embodiment is moved to a heating position.
  • FIG. 7 is a schematic cross-sectional view showing a state in which a third die is fitted to the second die according to the embodiment.
  • FIG. 8 is a schematic cross-sectional view showing a state where the second mold according to the embodiment is cooled.
  • FIG. 9 is a schematic cross-sectional view showing a state in which a third die according to a first modification of the present invention is fitted to a second die.
  • FIG. 10 is an enlarged sectional view showing a first mold according to a second modification of the present invention.
  • FIG. 11 is an enlarged cross-sectional view showing a second mold according to a third modification of the present invention.
  • FIG. 12 is a schematic cross-sectional view showing a state in which the first mold according to the third modification of the present invention is opened.
  • FIG. 13 is a schematic cross-sectional view showing a state in which a preform according to a third modification of the present invention is molded.
  • FIG. 1 is a schematic cross-sectional view of a molten glass lump forming apparatus 2 constituting a preform manufacturing apparatus 1 according to an embodiment of the present invention.
  • the molten glass lump forming apparatus 2 constitutes a preform manufacturing apparatus 1 together with a press forming apparatus 3 to be described later.
  • the molten glass lump forming device 2 includes a flow down device 10 that flows down the molten glass downward, a first mold 20 provided below the flow down device 10, and a first mold 20 that opens and closes and moves up and down.
  • An opening / closing device 60 as a moving device to be moved, and a second die 50 provided below the first die 20 are provided.
  • the flow-down device 10 includes a glass melting tank (not shown) in which molten glass is accommodated, and a nozzle 11 that extends downward from the glass melting tank to flow the molten glass.
  • a heating device may be provided that heats the molten glass flowing down from the nozzle 11 such that the temperature of the molten glass becomes equal to or higher than the soft spot. In this case, specifically, the molten glass flowing down from the nozzle 11 is heated so that the log r? (R? Is the viscosity, the unit is poise) is 7.65 or less.
  • the first mold 20 is provided below the nozzle 11 and has a receiving surface 20 A for receiving the molten glass flowing down from the flow-down device 10.
  • the first mold 20 is divided into two split molds 30 and 40 at the center. Accordingly, the receiving surface 20A is divided into the receiving surface 30A of the split mold 30 and the receiving surface 40A of the split mold 40.
  • a light emitting unit 21 that emits light such as visible light and infrared light
  • a sensor unit 22 that detects the emitted light
  • the split molds 30 and 40 are box-shaped having gas supply chambers 33 and 43 therein, respectively, and frame bodies 31 and 41 and molding portions 32 and 42 attached to the frame bodies 31 and 41, respectively. It consists of.
  • the frames 31 and 41 are made of a heat-resistant metal, here stainless steel.
  • the molding parts 32 and 42 are made of a heat-resistant porous material, here, a porous metal obtained by sintering stainless steel. Therefore, the molding parts 32 and 42 are provided with a large number of fine holes over the entire surface. To prevent gas leakage from these fine holes, the parts other than the receiving surfaces 30A and 40A are The coating has been applied to block unnecessary fine holes. As a result, a large number of micropores communicating with the gas supply chambers 33 and 43 and the outside are formed only on the receiving surfaces 30A and 40A.
  • the receiving surfaces 30A and 40A are in contact with the molten glass, and that the receiving surfaces 30A and 40A are made of gold or a gold alloy.
  • a part or all of the molded parts 32 and 42 which may form a gold or gold alloy film by coating, for example, on the heat-resistant porous material described above, may be made of gold or a gold alloy. Good.
  • gold alloys include aluminum, silicon, vanadium, chromium, titanium, iron, cobalt, nickel, copper, zinc, germanium, yttrium, zirconium, niobium, molybdenum, ruthenium, lead, silver, tin, hafnium, and tungsten. And a gold alloy containing at least one selected from the medium strength of platinum.
  • the gold content is preferably 90% or more.
  • the film thickness is preferably 0.1 ⁇ m or more and 5 ⁇ m or less.
  • water cooling pipes (not shown) for cooling the first mold 20 are provided on the outer circumferences of the frame bodies 31 and 41 of the split molds 30 and 40, respectively.
  • a cooling water supply pipe and a cooling water discharge pipe for circulating the cooling water are connected.
  • the split molds 30, 40 have gas supply pipes 34, which communicate with the gas supply chambers 33, 43, respectively.
  • gas supply chambers 33 and 43 When gas such as air or inert gas is supplied to the gas supply chambers 33 and 43 through the gas supply pipes 34 and 44, the gas is ejected from the receiving surfaces 30A and 40A to the outside through a large number of fine holes. .
  • the receiving surface 20A is particularly preferably a conical shape that preferably has a shape that is expanded from below to upward.
  • the shape of the receiving surface is not limited to a cone but may be a polygonal pyramid such as a triangular pyramid or a quadrangular pyramid.
  • the opening / closing device 60 includes support portions 63, 64 that support the split dies 30, 40, rotation shafts 61, 62 attached to the support portions 63, 64, and rotation shafts 61, 62. And a drive device (not shown) that moves and moves in the vertical direction. As shown in FIG. 2, the opening / closing device 60 has two split molds 30 and 40 that rotate downward in directions opposite to each other about the rotary shafts 61 and 62, thereby rotating the split molds 30 and 40. Open the first mold 20 by separating.
  • the distance between the split molds 30 and 40 that is, the opening width A of the first mold is determined by the outer diameter of the preform obtained.
  • the opening width A is set to 1.5 times the outer diameter of the desired preform.
  • the second mold 50 is provided on a circular rotary table (not shown), and when this rotary table rotates, the molten glass lump forming device 2, the press molding device 3, It is possible to move between.
  • a plurality of second molds 50 are provided on the rotary table at equal intervals, but only one second mold 50 is shown in FIGS.
  • the second mold 50 is formed of a heat-resistant metal, here, stainless steel.
  • the second mold 50 has a concave second receiving surface 50A, and the second receiving surface 50A is provided with a coating such as a nitrided metal or a carbide metal.
  • a nitrided metal include titanium nitride, titanium nitride aluminum, and chromium nitride.
  • the carbide metal include titanium carbide, chromium carbide, and tantalum carbide.
  • the second receiving surface 50A is made of gold or It can also be a gold alloy, and the gold alloy can include the same metals as those used in the first mold.
  • FIG. 3 is a cross-sectional view of the press molding apparatus 3 constituting the preform manufacturing apparatus 1.
  • the press molding apparatus 3 raises and lowers the second mold 50 described above, the third mold 70 having the concave molding surface 70A disposed above the second mold 50, and the third mold 70. And a pusher (not shown) that is fitted to the second die 50.
  • the second mold 50 has been moved from the molten glass lump forming apparatus 2 by a rotary table.
  • cooling water is circulated in the water cooling pipes of the split molds 30 and 40 of the first mold 20 so that the molten glass is not baked on the receiving surface 20A of the first mold 20 to cool the first mold 20. Keep it.
  • the gas is supplied to the gas supply chambers 33 and 43 from the gas supply pipes 34 and 44, and the surface force of the receiving surface 20A of the first mold 20 is ejected. Then, the molten glass flow is caused to flow down from the nozzle 11 of the flow down device 10 and the molten glass flow is received on the receiving surface 20A. The molten glass flow that has flowed into the first mold 20 is floated and held on the receiving surface 20A. When the molten glass flow reaches a predetermined amount, the opening / closing device 60 moves the first mold 20 downward. Then, the molten glass stream is cut by the surface tension to form a molten glass lump.
  • the rotary table is rotated to move the second mold 50 holding the molten glass lump as well as the downward force of the first mold 20.
  • another empty second mold 50 is positioned below the first mold 20 to prepare for the next molten glass lump.
  • the opening / closing device 60 is operated to close the first mold 20 and prepare for the next flow of molten glass.
  • the second mold 50 holding the molten glass lump is moved to the heating position, and the second mold 50 is heated to 500 to 700 ° C. by the heating device 81, and the molten glass is heated. Maintain the softened state of the mass.
  • the second mold 50 holding the molten glass block is moved below the third mold 70, and the third mold 70 is lowered as shown in FIG. Fit mold 70 to second mold 50. Then, the lower surface of the molten glass lump is press-molded by the second receiving surface 50A of the second mold 50, and the upper surface of the molten glass lump is press-molded by the molding surface 70A of the third mold 70. As a result, a double-sided convex preform is obtained. Thus, the preform can be molded with high accuracy by fitting the third mold 70 and the second mold 50 together.
  • the rotary table is rotated, and the second mold 50 from which the preform has been discharged is moved to the temperature adjustment position.
  • a gas gas ejection nozzle 82 is inserted into the second mold 50, and a gas such as air, low-temperature air, or nitrogen gas is ejected from the gas gas ejection nozzle 82, and the second mold 50 is ejected.
  • Cool mold 50 to 400-550 ° C. The cooled second mold 50 is moved again below the first mold, and the above-described steps are repeated.
  • the high temperature molten glass is received by the first mold 20, and after the temperature of the molten glass lump is lowered, the molten glass lump is moved to the second mold 50 to be molded. Since the surface of the mold 50 can be prevented from oxidizing, a preform that does not require the second mold 50 to be replaced at an early stage can be manufactured at low cost.
  • the opening / closing device 60 is configured to open and close the first mold 20, the glass block received by the first mold 20 can be easily moved to the second mold 50.
  • the opening / closing device 60 is configured to rotate the split dies 30, 40 downward, respectively, the split dies 30, 40 can be reliably opened and closed with a simple structure.
  • the receiving surface 20A has a shape expanded from the lower side by applying an upward force, it is possible to prevent a horizontal force from acting on the surface of the molten glass block, and the molten glass block can be moved downward.
  • the second mold 50 can be dropped accurately.
  • the present invention is not limited to the above-described embodiment, but includes modifications and improvements as long as the object of the present invention can be achieved.
  • the force obtained by molding the double-sided convex preform using the second mold 50 having the concave second receiving surface 50A and the third mold 70 having the concave molding surface 70A As shown in Figure 9
  • a single-sided convex single-sided preform can be molded.
  • a preform having an arbitrary shape and curvature can be formed by appropriately adjusting the curvature and shape of the second receiving surface of the second mold and the molding surface of the third mold.
  • the first mold 120, the first mold 120, and the two tee surfaces 120A and 120B are formed, and the first mold 120 is rotated about the rotation axis. Accordingly, the posture of the first mold 120 may be changed so that the medium force receiving surfaces of the two cavity surfaces 120A and 120B can be selected.
  • FIG. 11 shows another example of the second type.
  • the second mold 150 has a shape in which a second receiving surface 150A for receiving a molten glass lump is expanded from below to above, and a gas is jetted below the second receiving surface 150A. It has a structure having an outlet 160. Receiving surface 15
  • the structure of the OA is not particularly limited as long as it has a shape that is expanded by downward force and upward force. Examples of the shape include a conical shape and a wine glass shape, but a spherical preform is formed. From this point, a conical shape is preferably used.
  • the apex angle ⁇ of the cone (the angle formed by the two inclined lines of the second receiving surface 150A) be 5 degrees or more and 80 degrees or less. Preferably it is 10 degrees or more and 60 degrees or less, More preferably, it is 20 degrees or more and 40 degrees or less.
  • the jet outlet 160 is provided at one place at the lowest part of the second receiving surface 150A, but may be provided at two or more places.
  • the position of the spout 160 is not limited to the lowest part of the receiving surface as long as it is provided at a position where the molten glass block rotates and a spherical preform is formed.
  • an inert gas such as air or nitrogen gas can be used.
  • the diameter of the jet nozzle and the gas flow rate can be appropriately adjusted in consideration of the weight and viscosity of the glass lump.
  • a preform manufacturing apparatus using the second mold 150 will be described.
  • the molten glass is caused to flow down from the nozzle 11 of the flow down device 10, and the molten glass flow is received at the receiving surface 20A to form a molten glass lump.
  • the stringing part generated at this time melts into the molten glass block and disappears, as shown in FIG. 12, the first mold 20 is opened, The molten glass block is dropped onto the receiving surface 150A of the second mold 150.
  • the falling molten glass lump is formed into a spherical shape while intermittently contacting the second receiving surface 150A by the gas ejected from the ejection port 160.
  • the yarn pulling portion has disappeared on the receiving surface 20A of the first mold 20, it is possible to prevent the formation of striae in which the yarn cannot be entangled during molding.
  • the molten glass lump was dropped into the second mold, and the variation was measured.
  • the number of samples was 100, and the average distance from the center of the second mold was calculated.
  • the preform manufacturing apparatus described above (the receiving surface of the first mold was formed into a conical shape, and the opening and closing direction was turned downward and turned in opposite directions) was used.
  • the measurement conditions are as follows.
  • the nozzle tip force of the flow down device is also about 10mm away from the first mold.
  • the temperature of the molten glass flowing down is about 900 ° C
  • Time for the first mold to hold the molten glass block is about 2.0 seconds
  • the receiving surface of the first mold was conical and the opening / closing direction was horizontal. Other conditions are the same as in Example 1.
  • the receiving surface of the first mold was spherical, and the opening / closing direction was horizontal.
  • the other conditions are the same as in Example 1.
  • Example 1 the average variation was 15 mm. In Example 2, the average variation was 100 mm. In Example 3, the average variation was 150 mm. Therefore, according to this example, it was found that the accuracy of dropping the molten glass lump from the first mold to the second mold can be improved by making the receiving surface of the first mold conical. Furthermore, it was found that the first mold force can significantly improve the accuracy of dropping the molten glass lump onto the second mold by turning the opening and closing directions downward and rotating them in opposite directions.
  • Example 4 a preform manufacturing apparatus having the same configuration as that of Example 1 was used.
  • Example 5 a preform manufacturing apparatus having the same configuration as in Example 2 was used.
  • Example 6 a preform manufacturing apparatus having the same configuration as that of Example 3 was used.
  • the molten glass block can be reliably accommodated in the first mold force and the second mold by making the receiving surface of the first mold conical. Furthermore, it was found that the molten glass lump can be reliably accommodated from the first mold to the second mold by turning the opening and closing direction downward and rotating them in opposite directions.
  • Example 7 a preform manufacturing apparatus having the same configuration as that of Example 1 was used.
  • Example In No. 8 a preform manufacturing apparatus having the same configuration as in Example 2 was used.
  • Example 9 a preform manufacturing apparatus having the same configuration as that of Example 3 was used.
  • the defect rate of the preform can be reduced by making the receiving surface of the first mold conical. Furthermore, it has been found that the defective rate of the preform can be significantly reduced by rotating the opening / closing direction downward and rotating them in opposite directions.
  • the receiving surface of the first mold was conical, and the opening and closing direction was turned downward and turned in opposite directions.
  • the measurement conditions are as follows.
  • the nozzle tip force of the flow down device is also about 10mm away from the first mold.
  • the temperature of the molten glass flowing down is about 900 ° C
  • Time for the first mold to hold the molten glass block is about 2.0 seconds
  • Example 10 is the same as Example 10 except that the first mold was not used.
  • the measurement results are as follows. According to this example, it has been found that the use of the first mold can prevent the formation of striae. It was also found that popping out of the second mold force during preform formation can be reduced.
  • the operation time of the preform manufacturing equipment can be set in three ways: 50 minutes (1000 evaluation samples), 100 minutes (2000 evaluation samples), and 150 minutes (3000 evaluation samples)! It was measured.
  • the receiving surface of the first mold was plated with gold. Other conditions are the same as in Example 10.
  • a preform manufacturing apparatus having the same configuration as in Example 10 was used.
  • the measurement results are as follows. According to the present invention, it has been found that by applying gold plating to the first mold, seizure and scratches can be reduced and the defect rate can be reduced.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
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  • Manufacturing & Machinery (AREA)
  • Glass Compositions (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Surface Treatment Of Glass (AREA)

Abstract

La présente invention concerne un appareil de production d’ébauche capable de produire une ébauche à faible coût. Un appareil de production d’ébauche (1) présente un premier moule (20) destiné à recevoir du verre fondu et un second moule (50) destiné à recevoir un cueillage de verre fondu déplacé du premier moule (20). Le premier moule (20) présente une surface de réception (20A) destinée à recevoir le verre fondu et peut être divisé en deux ou plusieurs moules dissociables (30, 40) sur la surface de réception (20A).
PCT/JP2005/022633 2004-12-16 2005-12-09 Appareil et procede de production d’ebauche WO2006064723A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN200580042864.9A CN101080366B (zh) 2004-12-16 2005-12-09 型坯制造装置和型坯制造方法
DE112005003071T DE112005003071T5 (de) 2004-12-16 2005-12-09 Vorrichtung zur Herstellung einer Vorform und Vorformherstellungsverfahren
US11/793,034 US20080110207A1 (en) 2004-12-16 2005-12-09 Preform Production Apparatus and Preform Production Method

Applications Claiming Priority (6)

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JP2004364919 2004-12-16
JP2004-364919 2004-12-16
JP2005-047275 2005-02-23
JP2005047275 2005-02-23
JP2005-181100 2005-06-21
JP2005181100A JP4963800B2 (ja) 2004-12-16 2005-06-21 プリフォーム製造装置およびプリフォーム製造方法

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WO2006064723A1 true WO2006064723A1 (fr) 2006-06-22

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JP (1) JP4963800B2 (fr)
CN (1) CN101080366B (fr)
DE (1) DE112005003071T5 (fr)
TW (1) TW200626515A (fr)
WO (1) WO2006064723A1 (fr)

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CN101080366B (zh) 2014-09-03
CN101080366A (zh) 2007-11-28
DE112005003071T5 (de) 2007-11-15
TW200626515A (en) 2006-08-01
JP4963800B2 (ja) 2012-06-27
JP2006265085A (ja) 2006-10-05

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